172.5 off road
170 or 165 on road for me. and 170 on my crosser.
the theory goes.....
longer cranks give more leverage at slow cadence (off road)
while shorter cranks allow for a higher cadence and less 'force' (on road)
I'm not convinced by the argument of shorter cranks are better through ruts as we are talking only 2cm between a 160 and a 180 crank
and in most cases we are talking 5mm or less :shock: and we never take into account the V-factor of the pedals and cleats/shoes we are using.
As Public Enemy once said... "Don't believe the hype".